Signalling-circuit.



No. 897,413. PATENTED SEPT. 1, 1908. H. O. HUGH.

SIGNALING CIRCUIT.

AIPLIQATION FILED MAY 2, 1908.

sre'rns I tIniTi-r HARRY 0., ltUGI-LOF SANDWICH, ILLINOIS.

SIGNALING-CIRCUIT.

Application filed. May 2, 1908. Serial No. 430,458.

Specification of Letters Patent. I

Patented Sept. .1, 1908.

To all whom it may concern:

Be it known that I, HARRY O. HUGH, a citizen of the United States,residing at Sandwich, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement inSignaling-Circuits, ofwhich the following is a full, clear, concise, and exact description,reference being had to the accompanying drawings, forming a part of thisspecification.

My invention relates to signaling circuits and apparatus, and will bewell understood by reference to the accompanying drawing, showing thepreferred embodiment thereof, there being illustrated in the drawing asignal-receiving station and a signal-sending station, together withsuitable apparatus for receiving and sending signaling current.

The invention is of particular utility in con nection with telephoneexchange systems, though it is not to be restricted to this service. i

I have shown a signal-receiving bell a included in circuit with atransmission line .whose limbs I) b terminate in springs c c of aspring-jack. A connecting plug is provided with contact terminals thatare adapted to engage the springs 0 so that the cord circuit (1 may becaused to constitute a continuation of the transmission line b. I haveillustrated the springs c of a ringing key in connection with thestrands of the cord circuit d, the normal contacts of these springseffecting continuation of the cord-circuit, as is well understood, while.the alternate contacts of these springs constitute terminals connectedwith the circuit of a-pole-changing apparatus to be described. Theposition of the springs c is determined by the operator at the stationwhere the cord circuit equipment and the pole-changing apparatus islocated. 13 v The improved ap )aratus which I employ for changing thepolarity of the current impressed upon the alternate contacts of theringing key 0 will now be described. The ringing battery or othersuitable source of direct current. is indicated at f, the poles of thisbattery being permanently connected With contact elements or s rings gh. These springs '9 andjrare provided with normal contacts and withalternate contacts. When the springs 9 audit are in engagement withthe,normal contacts, current is impressed upon the alternate contacts ofthe ringing.

key e in a direction which may, for example,

berepresented by the arrows shown'in full lines. When the springs g andh are in engagement with their alternate contacts, current is impressedupon the alternate contacts of the ringing key in the reverse direction,represented by the dotted arrows. A polarized relay t is included incircuit with battery f and desirably in series therewith, this polarizedrelay being located between thecontacts-of the battery terminals 9 and hand -the alternate contacts of the ringing key (2, so that irrespectiveof the direction of the current flowing to the alternate contacts of theringing key, the polarized relay i always receives current when suchcurrent is passing to the ringing key.

The. olarized relay '5 has armature contacts w iich govern a local.circuit including an electro-magnet k and a battery Z, this moving thecontact terminals or springs g and h from engagement withtheir normalcontacts to engagement with theiralternate contacts, the magnet 7cacting against the force of a spring m, which serves to bring theelements 9 and it into engagement with their normal contacts whenthemagnet k is not in service. It is understood, of course, that the magnet70 possesses a force which is in excess of the spring m, whereby theshift of the battery terminals 9 and it may be effected from theirnormal contacts to their alternate contacts. When the operator closesthe ringing key, the current that is then passed to the alternatecontacts of the ringing key and throu h the relay 2', has a directionrepresented by the arrows in full lines, which direction is such asitoshift the armature of the relay 2' to the left, thereby to close thecircuit of the magnet it, so as to attract the battery terminals 9 itagainst the force of the spring m. lVhen the battery terminals g and hare engaged with their alternatecontacts as a consequence oftheoperation of the electroe magnet 75, currentthrough the polarized relay i is're versed, as. indicated by the arrows.

in dotted lines, whereby thearmature of the i'elay i is moved to theright to-open the local circuit including the magnet is, whereupon thespring m is permitted to restore the battery terminals g h to theirnormal position.

It sometimes happens that the ringing key is released at a ti e whichwill not permit the sufficient flow o current in the direction indicatedby the dotted arrows, to enable the relay 2' to open the'circuit of themagnet k.

0 Patent tuti To prevent such an Occurrence, I provide means,supplementing the ringing key, whereby current through the relay i inthe direction of the dotted arrows ma becontinned, so that the armatureof sai relay i ismoved to the right, thereby to open the circuit of themagnet is and permittin .the soring mto restore the terminals g an- 72to t 'ieir normal positions. The supplementing means desirably residesin a conductor a con taining a high resistance 0 of, say, eleventhousand ohms, which serves to continue the current from the battery fthrough the polar ized relay "i in the direction indicated by the dottedarrows, because of the establishment of a circuit which includes thebattery the conductor a, the resistance 0, the polarized relay i, thealternate contact of battery terminal h, and said battery terminal, thiscircuit oecasioning the restoration of the armatu re of the polarizedrelay to its normal righthand position, thereby opening the circuit ofthe magnet 7c and permitting the s ring m to restore the batteryterminals 9 am 72, to normal.

While I have herein shown and particularly described the preferredembodiment of my invention, I do not wish to be limited to the preciseconstruction and arrangement shown, as modifications may readily be madetherein without departing from the spirit of the invention, but

Having thus described my invention, I claim as new-and desire to 1. Apole-changing device including a source of current, switch elementsconsti terminals of said source of current, a nori'mil contact for eachof said switch elements, an alternate contact for each of said switchelen'iei'its, a conductor connected with one normal and one alternatecontact, a second conductor connected with the other normal and theother alternate contact, a polarized relayconnected in circuit with saidconductors, a magnet for ellecting engagement between said switchelements and their alternate contacts, the switch arin of the polarizedrelay includii'ig said electromagnet in circuit when said relay isincluded in circuit with the normal contacts of said switch elements,and serving to remove said electro magnet from circuit when said realyis included in circuit with the alternate contacts of said switchelements, in combination with a switch or key for connecting the saidconductors in circuit with a suitable translating device rcsponsive tothe currents of changed directions, said hey also controllin the circuitre- 'lationship of said polarized re ay, and a conductor including highresistance, included in ircuit with said source of current, one of itsen teri'ninals, the alternate contact of nal i the polarized relay,wheresecure by Let tc rs ear/ans remove said clectro-magnet from circuitis insured.

2. A-poJe-changing device including a source of current, switch elementsconstituting terminals of said source of current, a normal contact foreach of said switch elements, an alternate contact for each of saidswitch elements, a conductor connected with one normal and one alternatecontact, a second conductor connected with the other normal and theother alternate contact, a polar ized relay connected in circuit withsaid con ductors, a magnet for ell'ecting engagement between said switchelements and their alternatc contacts, the polarized relay includingsaid clectro-magnet in circuit when said relay is included in circuitwith the normal contacts of said switch elements, and serving to removesaid elcctro-magnct from circuit when said relay is included in circuitwith the alternate contacts of said switch elements, in

combination with a switch or key for connccting the said conductors incircuit with a suitable translating device responsive to the currents ofchanged directions, said hey also controlling the circuit rclationshi)of said polarized relay, and means supplementing the said key formaintaining the relayin circuit withthc alternate contacts in the eventof the failure of said hey so to do, whereby the removal of saidclectro-magnt from circuit is insured.

3. A pole changing device including a source of current, switchingmechanisni for re vcrsing said current, an electro-magnet for moving theswitr'zhing mechanism, a polarized relay receiving the current ofdifferent directions, operating, when receiving the current of onedirection, for including said elcctro-magnet in. circuit to cll'cct itsencrgization, and, when receiving current of another direction, toremove said electro-magnot from circuit, in combination with a switch orkey for enabling the impression of currents of changed directions upon asuitable translating deviee; said key also controlling the circuitrelationship of said polarized relay, and a conductor including high resistance, included in circuit with said source of current and saidpolarized relay when the first aforesaid switching mechanism is moved byits operating electro-magnet, whereby the operation of said polarizedrelay to remove said electro-magnet from circuit is insured.

4. A pole changing device including a source of current, switchingmechanism for reversing said current, an electro-magnet, for moving theswitching mechanism, a polarized relay receiving the current ofdifferent directions, operating, when receiving the current of onedirection, for including-said clectro-magnet in circuit to effect-itsenergization, and, when receiving current of another direction, toremove said electro-magpolarized operation of said polarized relay to inot from circuit, in combination with a able translating device, saidkey also controlling the circuitrelationship of said polarized relay,and means supplementing the said key for maintaining the polarized relayin a given circuit conditlon, whereby the removal of said electro-magnetfrom circuit is insured,

source of current, switch elements constituting terminals of said sourceof current, a

1 normal contact for each of said switch elements, an alternate contactfor each of said switch elements, a conductor connected with one normaland one alternate contact, a second conductor connected with the othernormal and the other alternate contact, a polarized relay connectedcircuit with said conductors, and a magnet for effecting engage-4 'mentbetween said switch elements and their alternate contacts, the polarizedrelay includin said electro-magnet in circuit when said re ay isincluded in circuit withthe normal contacts of said switch elements, and

serving to remove said electro-magnet from circuit when said relay isincluded in circuit with the alternate contacts of said switch elements.

I 6. 'A,,pole-changing deyice including a source of current, switchingmechanism for reversing said current, an electrodnagnet for 5. A polechanging device mcludlng a moving the switching mechanism, and apolarized relay, receiving the current of raif ferent directions,-operating,"when receiving,

the -current of one direction," for including said electro-magnet incircuit to effect its energization, and, when receiving current of another directiom-to remove said electro-mag net from'circuit.

In Witness whereof, Ihereunto subscribe my name this 30th day of AprilA. 1)., 1968.

HARRY O. RUG H Witnesses:

L. G. Simon, G. L. CRAGG.

